Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a61da0ba4b35ef…

MALICIOUS

PDF

86.8 KB Created: 2021-08-10 08:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40038eb93dad991be4e02eb89de82781 SHA-1: eb474ef75d068e36df53ce5fa4fb4452d032a97b SHA-256: 50a61da0ba4b35ef18e2bf9dfd13399b73c94f6290a6610af1676e129c52a388
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and potentially disposable hosting, likely to distribute further malware or phishing content. The presence of a 'download button' lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=accountancy+class+11+chapter+3+notes+pdf PDF link annotation
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0e2567dee---25569142236.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607328dd781db---84840007937.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/88307928255.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f47a22a07f---89237303574.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/6c6e38de76aeb350b4f5f11aad83631d/dimaboruxupek.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/75903521760.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/kisarusupopefapikiv.pdfIn PDF document text
    • https://5uempat.com/contents//files/vokek.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/modexigugata.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/98278494093.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cm2gbo1gru0trdhjmjgdbehs50/39353358989.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/73956803995.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089435465ccc---77854195161.pdfIn PDF document text
    • https://norservis.com/files/files/xanusanumidakele.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/fetefuju.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/97abe08020cd472acb7a8717de1b5a74/54607560563.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/57584735747.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/mizilodatafumabarepemupa.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/29479611132.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/14400723323.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/debinukalorizuguvuwop.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/69813881447.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d34bc54015---tozazazaf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 17648 bytes
SHA-256: 1834d6b22db39fd7ee8654651cc4fafa5fc8eccd122b31427330f8388c10fbcf
font_01_sfnt_off000119b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B4 11044 bytes
SHA-256: 0b83c08d2174e8b03a6526ff48dfe1c7a791bce5cc485965f9f383c77464cac9
font_02_sfnt_off0001338f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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